According to the documentation, "smart size" is the best option for banners.
But it means that the banner height can be either 32, 50 or 90 pixels. How do I know the real banner height, to make sure that objects on my layout don't overlap with the banner? Or should I always allocate 90px?
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Related question, that may be a bug - why after I hide a banner, I can't show it again? I use "Show the current banner advert" action, but nothing happens.